allowing expressions within range literals

lib/coffee_script/grammar.y

@@ -265,8 +265,10 @@ rule
 
   # The range literal.
   Range:
-    "[" Value "." "." Value "]"       { result = RangeNode.new(val[1], val[4]) }
-  | "[" Value "." "." "." Value "]"   { result = RangeNode.new(val[1], val[5], true) }
+    "[" Expression
+      "." "." Expression "]"          { result = RangeNode.new(val[1], val[4]) }
+  | "[" Expression
+      "." "." "." Expression "]"      { result = RangeNode.new(val[1], val[5], true) }
   ;
 
   # The array literal.

lib/coffee_script/lexer.rb

@@ -19,7 +19,7 @@ module CoffeeScript
 
     # Token matching regexes.
     IDENTIFIER = /\A([a-zA-Z$_]\w*)/
-    NUMBER     = /\A((\b|-)((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?)))\b/i
+    NUMBER     = /\A(\b((0(x|X)[0-9a-fA-F]+)|([0-9]+(\.[0-9]+)?(e[+\-]?[0-9]+)?)))\b/i
     STRING     = /\A(""|''|"(.*?)[^\\]"|'(.*?)[^\\]')/m
     JS         = /\A(``|`(.*?)[^\\]`)/m
     OPERATOR   = /\A([+\*&|\/\-%=<>:!]+)/